2D lists

Mikael Olofsson mikael at isy.liu.se
Tue Jan 21 13:57:00 CET 2003


On 21 Jan 2003 03:12:10 -0800
alan_salmoni at yahoo.com (Alan James Salmoni) wrote:
> a = [0] * 3
> b = []
> b.append(a)
> b.append(a)

Not so good:

>>> a = [0] * 3
>>> b = []
>>> b.append(a)
>>> b.append(a)
>>> b
[[0, 0, 0], [0, 0, 0]]
>>> b[0][0]=1
>>> b
[[1, 0, 0], [1, 0, 0]]

Oops!

> c = [[0]*3,[0]*3]

This one works.

/Mikael

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